This unit works perfectly and gives information about the alternator and battery. It is accurate and easy to use outside or inside the vehicle. It tells you how well the alternator is working and whether the battery is properly charged. It's digital and visual if you don't know what volts are and what digital readings mean. You must understand that a battery charge of 12.6 volts is the minimum battery charge and that the alternator must be running at 13.5 to 14.2 volts for charging. and whether the alternator really charges the battery and is fully functional.
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